The bodies of a man and a woman who police suspect were killed in a murder-suicide were discovered inside a minivan on Oyster Bay Road in Matinecock Monday morning, Nassau's chief of homicide said.

A motorist who came upon the scene just north of the Planting Fields Arboretum reported seeing a disturbance -- including aggressive movement -- in the van, a 1999 Toyota Sienna, followed by loud noises, said Det. Lt. John Azzata, commanding officer of the Nassau homicide squad.